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Contents
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Weather in January
January, like December, in Flat Rock, Illinois, is a wintry winter month, with temperature in the range of an average high of 36.1°F (2.3°C) and an average low of 23.4°F (-4.8°C). Flat Rock's coldest weather arrives in January, when temperatures average a high of 36.1°F (2.3°C) and a low of 23.4°F (-4.8°C). Weather in January »
Weather in February
February, the last month of the winter in Flat Rock, is another cold month, with temperature in the range of an average high of 41°F (5°C) and an average low of 27.1°F (-2.7°C). In February, the average high-temperature registers at a still cold 41°F (5°C), nearly identical to January's 36.1°F (2.3°C). Weather in February »
Weather in March
March, the first month of the spring in Flat Rock, is a fresh month, with an average temperature ranging between min 36.7°F (2.6°C) and max 53.1°F (11.7°C). March's arrival coincides with a temperature rise, moving from February's cold 41°F (5°C) to a cool 53.1°F (11.7°C). Weather in March »
Weather in April
April is a refreshing spring month in Flat Rock, Illinois, with an average temperature varying between 64°F (17.8°C) and 46.9°F (8.3°C). With the onset of April, the average high-temperature slightly shifts from March's cool 53.1°F (11.7°C) to an enjoyable 64°F (17.8°C). Weather in April »
Weather in May
May, the last month of the spring in Flat Rock, is a moderately hot month, with temperature in the range of an average high of 73.8°F (23.2°C) and an average low of 57.2°F (14°C). May comes with an increase, with the average high-temperature moving from a refreshing 64°F (17.8°C) in April to a moderately hot 73.8°F (23.2°C). Weather in May »
Weather in June
June, the first month of the summer in Flat Rock, is still a warm month, with an average temperature ranging between max 82°F (27.8°C) and min 65.3°F (18.5°C). The beginning of June marks a minor shift in the average high-temperature, moving from May's 73.8°F (23.2°C) to a still warm 82°F (27.8°C). Weather in June »
Weather in July
July, the same as June, is another warm summer month in Flat Rock, Illinois, with an average temperature varying between 83.8°F (28.8°C) and 66.9°F (19.4°C). Flat Rock's July weather reaches an average high of 83.8°F (28.8°C) and an average low of 66.9°F (19.4°C), making it the warmest month. The heat index in July is computed to be a hot 93.2°F (34°C). Weather in July »
Weather in August
The last month of the summer, August, is also a moderately hot month in Flat Rock, Illinois, with an average temperature varying between 64.8°F (18.2°C) and 82.6°F (28.1°C). August's onset brings an average high-temperature of a still warm 82.6°F (28.1°C), showing a minute difference from July's 83.8°F (28.8°C). Weather in August »
Weather in September
The first month of the autumn, September, is still a warm month in Flat Rock, Illinois, with temperature in the range of an average low of 59.5°F (15.3°C) and an average high of 77.9°F (25.5°C). Flat Rock's average high-temperature marks a still moderately hot 77.9°F (25.5°C) with the advent of September, closely mirroring that of the preceding month. Weather in September »
Weather in October
October, the same as September, is another enjoyable autumn month in Flat Rock, Illinois, with temperature in the range of an average high of 65.5°F (18.6°C) and an average low of 48.6°F (9.2°C). With the onset of October, Flat Rock experiences a modest temperature adjustment, with the average high-temperature receding from a warm 77.9°F (25.5°C) in September to a comfortable 65.5°F (18.6°C). Weather in October »
Weather in November
The last month of the autumn, November, is also a fresh month in Flat Rock, Illinois, with an average temperature ranging between max 51.4°F (10.8°C) and min 37.4°F (3°C). The onset of November brings a small change in high-temperatures, falling from a refreshing 65.5°F (18.6°C) in October to a cool 51.4°F (10.8°C). Weather in November »
Weather in December
The first month of the winter, December, is still a cold month in Flat Rock, Illinois, with an average temperature ranging between max 41.2°F (5.1°C) and min 29.8°F (-1.2°C). The onset of December results in a decrease in the average high-temperature, receding from a cool 51.4°F (10.8°C) in November to an icy 41.2°F (5.1°C). Weather in December »
[Resources]Frequently asked questions
What time of the year is the coldest in Flat Rock?
The month of January sees the average lowest temperatures, reaching 36.1°F (2.3°C) at the peak and 23.4°F (-4.8°C) at the low.
How many days does it rain in Flat Rock?
In Flat Rock, during the entire year, the rain falls for 162.4 days and collects up to 36.85" (936mm) of precipitation.
When does it snow in Flat Rock?
January through April, November and December are months with snowfall.
When does it snow the most in Flat Rock?
The month with the most snowfall in Flat Rock is January, when snow falls for 6.8 days and typically aggregates up to 2.32" (59mm) of snow.
How many days does it snow in Flat Rock?
Throughout the year, in Flat Rock, Illinois, there are 22 snowfall days, and 7.64" (194mm) of snow is accumulated.
What is the month with the least sunshine in Flat Rock?
With an average of 4.2h of sunshine, January has the least sunshine of the year.
When is the lowest UV index in Flat Rock?
The months with the lowest UV index in Flat Rock, Illinois, are January, February, November and December, with an average maximum UV index of 2.
When is Daylight Saving Time (DST) in Flat Rock?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Flat Rock, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from CDT to CST.
What is the wettest month in Flat Rock?
April is the month with the most rainfall in Flat Rock, Illinois. Rain falls for 15.8 days and accumulates 5.2" (132mm) of precipitation.
When it does not snow in Flat Rock?
May through October are months without snowfall in Flat Rock.
When are the longest days in Flat Rock?
June has the longest days of the year, with an average of 14h and 54min of daylight.
What month has the most sunshine in Flat Rock?
The month with the most sunshine is June, with an average of 10.3h of sunshine.
When is the highest UV index in Flat Rock?
June through August, with an average maximum UV index of 6, are months with the highest UV index in Flat Rock.
What time of the year is the hottest in Flat Rock?
The warmest temperatures in Flat Rock, Illinois, occur during July, when averages reach a peak of 83.8°F (28.8°C) and a low of 66.9°F (19.4°C).
What is the most humid month in Flat Rock?
With an average relative humidity of 81%, July is the most humid month in Flat Rock, Illinois.
What is the driest month in Flat Rock?
The month with the least rainfall in Flat Rock is September, when the rain falls for 12.6 days and typically collects 1.89" (48mm) of precipitation.
What is the least humid month in Flat Rock?
October is the least humid month in Flat Rock, Illinois, with an average relative humidity of 71%.
What is the month with the shortest days in Flat Rock?
With an average of 9h and 30min of daylight, December has the shortest days of the year.
Average temperature
Flat Rock, IL
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (36.1°F).
The month with the highest average low temperature is July (66.9°F).
The coldest month (with the lowest average low temperature) is January (23.4°F).
Average pressure
Flat Rock, IL
- Average pressure in January:
30.15"Hg - Average pressure in February:
30.11"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.95"Hg - Average pressure in May:
29.97"Hg - Average pressure in June:
29.93"Hg
- Average pressure in July:
29.98"Hg - Average pressure in August:
29.99"Hg - Average pressure in September:
30.03"Hg - Average pressure in October:
30.04"Hg - Average pressure in November:
30.14"Hg - Average pressure in December:
30.13"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed
Flat Rock, IL
- Average wind speed in January:
10mph - Average wind speed in February:
10mph - Average wind speed in March:
9.9mph - Average wind speed in April:
9.8mph - Average wind speed in May:
8.1mph - Average wind speed in June:
7.1mph
- Average wind speed in July:
5.9mph - Average wind speed in August:
5.9mph - Average wind speed in September:
6.7mph - Average wind speed in October:
8.5mph - Average wind speed in November:
9.1mph - Average wind speed in December:
9.1mph
The windiest months (with the highest average wind speed) are January and February (10mph).
The calmest months (with the lowest average wind speed) are July and August (5.9mph).
Average humidity
Flat Rock, IL
The month with the highest relative humidity is July (81%).
The month with the lowest relative humidity is October (71%).
Average rainfall
Flat Rock, IL
- Average rainfall in January:
2.56" - Average rainfall in February:
2.17" - Average rainfall in March:
2.8" - Average rainfall in April:
5.2" - Average rainfall in May:
3.98" - Average rainfall in June:
4.13"
- Average rainfall in July:
3.43" - Average rainfall in August:
2.76" - Average rainfall in September:
1.89" - Average rainfall in October:
2.56" - Average rainfall in November:
2.48" - Average rainfall in December:
2.91"
The wettest month (with the highest rainfall) is April (5.2").
The driest month (with the least rainfall) is September (1.89").
Average rainfall days
Flat Rock, IL
- Average rainfall days in January:
8.4 days - Average rainfall days in February:
9 days - Average rainfall days in March:
14.8 days - Average rainfall days in April:
15.8 days - Average rainfall days in May:
19.8 days - Average rainfall days in June:
17.2 days
- Average rainfall days in July:
18.8 days - Average rainfall days in August:
14.3 days - Average rainfall days in September:
12.6 days - Average rainfall days in October:
11.6 days - Average rainfall days in November:
10 days - Average rainfall days in December:
10.1 days
The month with the highest number of rainy days is May (19.8 days).
The month with the least rainy days is January (8.4 days).
Average snowfall
Flat Rock, IL
The month with the highest snowfall is January (2.32").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
Flat Rock, IL
- Average snowfall days in January:
6.8 days - Average snowfall days in February:
5.8 days - Average snowfall days in March:
2.6 days - Average snowfall days in April:
0.3 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0 days - Average snowfall days in November:
1.8 days - Average snowfall days in December:
4.7 days
The month with the highest number of snowfall days is January (6.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Flat Rock, IL
- Average daylight in January:
9h and 5min - Average daylight in February:
10h and 5min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 1min - Average daylight in May:
14h and 2min - Average daylight in June:
14h and 5min
- Average daylight in July:
14h and 4min - Average daylight in August:
13h and 4min - Average daylight in September:
12h and 2min - Average daylight in October:
11h and 1min - Average daylight in November:
10h and 1min - Average daylight in December:
9h and 3min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in January:
4h and 1min - Average sunshine in February:
4h and 2min - Average sunshine in March:
6h and 1min - Average sunshine in April:
8h and 0min - Average sunshine in May:
8h and 4min - Average sunshine in June:
10h and 2min
- Average sunshine in July:
10h and 1min - Average sunshine in August:
10h and 1min - Average sunshine in September:
8h and 5min - Average sunshine in October:
6h and 4min - Average sunshine in November:
5h and 2min - Average sunshine in December:
4h and 2min
The month with the most sunshine is June (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).
Average sunshine days
Flat Rock, IL
- Average sunshine days in January:
16.3 days - Average sunshine days in February:
13.6 days - Average sunshine days in March:
13.8 days - Average sunshine days in April:
12 days - Average sunshine days in May:
9.7 days - Average sunshine days in June:
10 days
- Average sunshine days in July:
9.8 days - Average sunshine days in August:
14.1 days - Average sunshine days in September:
15.1 days - Average sunshine days in October:
17.9 days - Average sunshine days in November:
18 days - Average sunshine days in December:
16.5 days
The month with the most sunshine days is November (18 days).
The month with the least sunshine days is May (9.7 days).
Average UV index
Flat Rock, IL
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover
Flat Rock, IL
The month with the most cloud cover is January (Cloud cover 55).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility
Flat Rock, IL
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Flat Rock, Illinois, USA
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